Number of Days of 40 °C in London by Year

This page contains a list of the number of days in each year that the high temperature equaled or exceeded 40 degrees Celsius in London, Ontario, between 1883 and 2024.

Also see:

Which year had the most 40° days?

Based on NOAA records, the year 1918 holds the record for the most 40 °C days in London history. There were 1 days with a high temperature of at least 40 degrees that year.

How many so far this year (2024)?

It has not reached 40 degrees Celsius in London so far in 2024. As of April 27, the highest temperature this year is 73 °F.

The last time it reached at least 40° C was August 6, 1918.

Years marked with a gold background have more than 5% incomplete data
Click column headers to sort

Year	Rank	Days >= 40 °C
2024	2	0
2023	2	0
2022	2	0
2021	2	0
2020	2	0
2019	2	0
2018	2	0
2017	2	0
2016	2	0
2015	2	0
2014	2	0
2013	2	0
2012	2	0
2011	2	0
2010	2	0
2009	2	0
2008	2	0
2007	2	0
2006	2	0
2005	2	0
2004	2	0
2003	2	0
2002	2	0
2001	2	0
2000	2	0
1999	2	0
1998	2	0
1997	2	0
1996	2	0
1995	2	0
1994	2	0
1993	2	0
1992	2	0
1991	2	0
1990	2	0
1989	2	0
1988	2	0
1987	2	0
1986	2	0
1985	2	0
1984	2	0
1983	2	0
1982	2	0
1981	2	0
1980	2	0
1979	2	0
1978	2	0
1977	2	0
1976	2	0
1975	2	0
1974	2	0
1973	2	0
1972	2	0
1971	2	0
1970	2	0
1969	2	0
1968	2	0
1967	2	0
1966	2	0
1965	2	0
1964	2	0
1963	2	0
1962	2	0
1961	2	0
1960	2	0
1959	2	0
1958	2	0
1957	2	0
1956	2	0
1955	2	0
1954	2	0
1953	2	0
1952	2	0
1951	2	0
1950	2	0
1949	2	0
1948	2	0
1947	2	0
1946	2	0
1945	2	0
1944	2	0
1943	2	0
1942	2	0
1941	2	0
1940	2	0
1939	2	0
1938	2	0
1937	2	0
1936	2	0
1935	2	0
1934	2	0
1933	2	0
1932	2	0
1931	2	0
1930	2	0
1929	2	0
1928	2	0
1927	2	0
1926	2	0
1925	2	0
1924	2	0
1923	2	0
1922	2	0
1921	2	0
1920	2	0
1919	2	0
1918	1	1
1917	2	0
1916	2	0
1915	2	0
1914	2	0
1913	2	0
1912	2	0
1911	2	0
1910	2	0
1909	2	0
1908	2	0
1907	2	0
1906	2	0
1905	2	0
1904	2	0
1903	2	0
1902	2	0
1901	2	0
1900	2	0
1899	2	0
1898	2	0
1897	2	0
1896	2	0
1895	2	0
1894	2	0
1893	2	0
1892	2	0
1891	2	0
1890	2	0
1889	2	0
1888	2	0
1887	2	0
1886	2	0
1885	2	0
1884	2	0
1883	2	0

Weather Station Details

Years	Station	Coordinates
2002–2024	London CS	location
1941–2002	London International Airport	location
1932–1940	London Lambeth A	location
1883–1931	London South	location